Volume 31 Issue 03
Mar.  2005
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Wang Hengyu, Lee Chunhian. Development of a reaction-diffusion model for erosion and identification of the associated diffusion coefficient[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(03): 293-297. (in Chinese)
Citation: Wang Hengyu, Lee Chunhian. Development of a reaction-diffusion model for erosion and identification of the associated diffusion coefficient[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(03): 293-297. (in Chinese)

Development of a reaction-diffusion model for erosion and identification of the associated diffusion coefficient

  • Received Date: 26 Aug 2003
  • Publish Date: 31 Mar 2005
  • It was proposed that the adsorption (including both physical and chemical) was the principal mechanism for AO(atomic oxygen) in LEO(low earth orbit) interactingwith surface materials. The remaining secondary physical or chemical mechanisms could be included into the principal mechanism. The reaction-diffusion equation of erosion could thus be constructed. In addition, with the aid of the classical theory of collision dynamics molecules, one could verify that the physical erosion term in the reaction-diffusion equation happened to be higher order and could be neglected. The diffusion coefficient followed from Eyring’s theory of absolute rates. Numerical simulations of AO effects over the space material Kapton were conducted to validate the model. The numerical results on thickness losses and a 2-D undercutting of Kapton in LEO environment were presented. The simulation results fit NASA’s flight test data well within a proper error range.

     

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